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The second Biscuit robot created by the professor. His appearance is similar to the old model Biscuit No. 1, the only difference being the number of the hat. Unlike Biscuit No. 1, Biscuit No. 2 was built with the intention to speak. (Source: Wikipedia)
The main characters homeroom teacher. Shown to be very witty and banterous. His hatred for Sasazuka-kun is also very clear from episode two.
Age: 5 An orphaned girl who stays with Riquinni. She does not speak much. Shirotsugh initially thought she was a boy. (Sources: animeenglishdubreviews.blogspot.com, Japanese Wikipedia)
An immortal companion of Yuta. She was raised by a group of old women that kept her captive and incapacitated in a hut. They were really mermaids that sought to eat Mana once she reached her adolescence to regain their youth. She travels with Yuta since, and possesses a large sense of loyalty and feelings towards him, but due to her somewhat naive and spoiled nature, she doesn't seem to truly realize that her emotions towards him are possibly love or just simple affection.
Instructor with glasses that first appears in episode 3 and is later seen in episode 5 teaching the 104th Corps what is known about the Titans and their origins.
